Numbers 6:24-26 is commonly referred to as the trifold blessings that Aaron, the Priest was asked to convey to God’s people. It reads “The LORD bless thee, and keep thee: The LORD make his face shine upon thee, and be gracious unto thee: The LORD lift up his countenance upon thee, and give thee peace.”

The LORD bless thee and keep thee talks about MERCY, for the LORD thy God [is] a merciful God; he will not forsake thee, neither destroy thee, nor forget the covenant of thy fathers which he sware unto them (Deuteronomy 4:31). In other words, He will keep thee as He has promised because He is merciful and does not give us what we deserve.
The LORD make his face shine upon thee, and be gracious unto thee talks about His GRACE. For the righteous LORD loveth righteousness; his countenance (face) doth behold the upright (those made blameless) (Psalm 11:7).
The LORD lift up his countenance upon thee, and give thee peace talk about His PEACE, the Peace that passeth all understanding and which keeps our hearts and minds through Christ Jesus (Philippians 4:7).

Closer introspection of this trifold blessing reveal that the three elements of blessings that is Mercy, Grace and Peace are ALL fulfilled by Jesus Christ. The LORD is MERCIFUL to them that confess and because of His Mercy, they are blessed and kept by Him. They are not blown away like chaff and nothing can snatch them from His sovereign and secure hands. The LORD is GRACIOUS and gives Eternal life to all who believe in Jesus. To behold the Holy face of the Lord when we are sinful is sure death for His Holiness is consuming, but those who believe in Jesus are imputed righteousness and made upright (blameless). And the blameless God does turn His face to and beholds and grants them that which they don’t deserve, in other words Grace. The LORD is PEACE to them that believe in Him, which is the result of Grace and Mercy at work and He keeps us in perfect Peace, when we trust Him and fix our minds on Him (Isaiah 26:3).

The trinity of blessings – Mercy, Grace and Peace are made possible by Jesus Christ, the God of Mercy, Grace and Peace.